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Neethu uNeethu u 

After resetting my domain I am getting this error while completing a trailhead challenge.

There was an unhandled exception. Please reference ID: MBTUVXVW. Error: Faraday::ConnectionFailed. Message: Failed to open TCP connection to resourceful-moose-s6bke2-dev-ed.my.salesforce.com:443 (getaddrinfo: Name or service not known)
NagendraNagendra (Salesforce Developers) 
Hi Neethu,

Sorry for this issue you are facing.

May I suggest you please refer to below link which might help you further. Hope this helps.

Kindly mark this as solved if the reply was helpful.

Thanks,
Nagendra
Deepali KulshresthaDeepali Kulshrestha
Hi Neethu,

Please refer to this link below:
https://developer.salesforce.com/forums/?id=9060G000000BfEGQA0

I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.

Thanks and Regards,
Deepali Kulshrestha